砂墊層、填砂技術(shù)交底.doc

交底內(nèi)容：
一、碎石墊層施工
粉噴樁施工完成28天，并經(jīng)檢測(cè)合格后，在其上鋪30cm厚級(jí)配碎石墊層，碎石最大粒徑不宜大于3cm。
二、砂墊層施工
1、碎石墊層施工完畢后，在上面鋪一層40型雙向土工格柵，土工格柵雙向抗拉強(qiáng)度不小于40KN/m，斷裂延伸率小于10%，其連接采用鉛絲綁扎，搭接寬度不小于0.1m。在其上鋪20cm中粗砂墊層。
2、材料應(yīng)具有良好的透水性，不含有機(jī)質(zhì)、粘土塊、和其它有害物質(zhì)的中粗砂，其中粒徑小于0.074mm顆粒含量應(yīng)不大于3%,有機(jī)物含量不大于1%，做好各項(xiàng)技術(shù)指標(biāo)的材料試驗(yàn)。
3、必須按照施工圖紙的厚度0.2m鋪筑輾壓，砂墊層伸出路堤坡腳外1m。
4、砂墊層應(yīng)按圖紙要求做成橫坡，以便橫向排水、滲透，斷面尺寸不能小于設(shè)計(jì)值，按每200m檢查4處的方法進(jìn)行檢查。
三、填砂施工
1、砂墊層處理完后經(jīng)監(jiān)理工程師簽證同意進(jìn)行下道工序即填砂施工時(shí)，應(yīng)立即組織人員機(jī)械進(jìn)行施工。
2、應(yīng)采用分層填筑，分層填筑的厚度一般不大于30cm。
3、填砂過程中預(yù)埋好沉降觀測(cè)設(shè)施，觀測(cè)沉降量、速率、水平位移，做好原始記錄，確定每一層的合理填土高度和填筑速率。
4、 地面橫坡不陡于1：5時(shí)，可及時(shí)進(jìn)行下道工序施工。
5、填筑路的過程中，應(yīng)嚴(yán)格控制填料的壓實(shí)度。應(yīng)滿足：機(jī)動(dòng)車道路槽底0~80cm范圍內(nèi)不小于93%，路槽底80cm以下不小于90%。
Cards on the table contents:
First, construction of gravel cushion
Pile Construction completed 28 days and tested after passing grade in his upper berth with 30cm thick gravel pads, the largest stone size should be less than 3cm.
Second, construction sand cushion
1, after completion of construction gravel cushion in the top layer of 40-type two-way geogrid, geogrid tensile strength of not less than two-way 40KN / m, elongation of less than 10%, its connection with wire banding, lap width of not less than 0.1m. 20cm in the coarse sand in its upper berth cushion.
2, material should have good water permeability, non-organic matter, clay blocks, and other harmful substances in the coarse sand, which is less than 0.074mm particle size should not exceed 3% of the content, organic matter content of less than 1% various technical indicators do materials testing.
3, the construction drawings must be in accordance with the thickness of 0.2m paved rolling, out of sand cushion foot embankment outside the 1m.
4, sand cushion made of cross slope requirements shall be drawing to horizontal drainage, infiltration, cross section size not less than the design value, 4 per 200m inspection methods to be checked.
Third, the construction of sand fill
1, sand cushion has been dealt with by the supervising engineer visa agreed that the next process sand filling works, should immediately organize personnel to conduct construction machinery.
2, should be stratified filling, filling the thickness of the layer does not exceed 30cm.
3, the process of filling sand embedded good settlement observation facilities, observation settlement, rate, horizontal displacement, good original records to determine the filling height of each layer and filling a reasonable rate.
4, the ground cross slope is not steep at 1:5, can be timely construction of the next process.
5, the process of filling the road, should strictly control the degree of compactness. Should be met: 0 ~ 80cm bottom road vehicle within not less than 93%, Road bottom 80cm of not less than 90% less.
 

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